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it is called either Pyrosulfuric Acid or Disulfuric Acid or oleam. Even though you can make sulphuric acid by combining SO3 and H20,the process is extremely dangerous.

thus, SO3 is first mixed with previously made sulphuric acid. The chemical process is

SO3 + H2SO4 -> H2S2O7

This H2S2O7 (oleam) is diluted in water to give sulphuric acid.

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8y ago

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The chemical formula for oleum is?

Formula: H2S2O7


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The chemical formula of pyrosulfuric acid is H2S2O7.


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Sulphuric anhydride is H2S2O7,... H2SO4 + H2SO4-----> H2S2O7 + H2O


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The density of H2S2O7, also known as disulfuric acid, is approximately 1.90 g/cm^3 at room temperature.


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You have answered the question for yourself. The scientific name is 'Sulphuric Acid' . It known universally as sulphuric acid. The US spelling is 'sulfuric acid'. The formula is 'H2SO4'. Do NEITHER confuse with 'sulphurous acid'. This is an entirely different substance. Its formula is 'H2SO3'. NOR 'fuming sulphuric acid (oleum) , the formula is 'H2S2O7' .


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Oleum or fuming sulfuric acid refers to a solution of various compositions of sulfur trioxide (SO3) in sulfuric acid (H2SO4), which can also be described by the formula H2SO4.xSO3 where x is defined as the molar free sulfur trioxide content.As being a mixture it does not have a chemical structural formula.


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SO3 is COVALENT. It is sulphur trioxide. and is used to make sulphuric acid. At STP it is a gas , and is dissolved in more sulphuric acid to make oleum (fuming sulphuric acid) ( H2S2O7). Oleum is 'NASTY' stuff. Oleum is then siddolved into water to form sulphuric acid. SO3 + H2SO4 = H2S2O7 H2S2O7 + H2O = 2H2SO4.


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